Barracuda Load Balancer ADC - Barracuda Load Balancer offers secure application delivery & load balancing.
Cisco Umbrella - Cisco Umbrella is a cloud security platform that provides the first line of defense against threats on the internet.
nginx - A high performance free open source web server powering busiest sites on the Internet.
WebTitan - WebTitan is an advanced DNS based web content filter and web security layer that blocks malware, ransomware and phishing attempts as well as providing web content control. Cloud and gateway versions available.
Haproxy - Reliable, High Performance TCP/HTTP Load Balancer
DNSFilter - DNSFilter offers DNS-Based Content Filtering & Threat Protection.